Flying Dragon Cheats (Nintendo 64)

To play as Bokuchin you must beat him in a normal game.

Metal Robo Na Hanna has a very powerful magic. The magic he has prevents him from taking
damage, and to make it worse damage normally done to him is done to you! 
  The only way to defeat him is to use the item "Mr. Virus" which steals his
invincibility. The item "strategy book vol. 8" says it steals all powers, but it doesn't.
When you get "Mr. Virus" and are fighting Metal Robo Na Hanna use a projectile attack or a
projectile secret buster.

To get Ryumaou on the virtual character select screen, beat SD Hiryu with Ryumaou. After
beating it a couple of times you should get the "Skull of Devil King" as a random prize.
This enables you to pick Ryumaou at the Virtual Hiryu select screen.

For an easier game, go to the OPTIONS screen and set the difficulty to EASY, then press
LEFT 20 times to enable the VERY EASY level.

For a greater challenge, go to the OPTIONS screen and set the difficulty to HARD, then
press RIGHT 20 times. You can now access the VERY HARD difficulty setting. Good luck!

To play as Ryumaou, you have to earn your way up to the "Ryumaou Tournament", and then
beat it.

On game select go to SD HIRYU. From there fight in the circuit. Platinum characters will
make cameo appearances before the championships. Each time you beat a platinum character
you win a medal. If you collect all 10 medals you can use the Platinum characters.